SuggestionsStore unittests not using real time.

components/suggestions/suggestions_store.cc

Index: components/suggestions/suggestions_store.cc
diff --git a/components/suggestions/suggestions_store.cc b/components/suggestions/suggestions_store.cc
index 01c8e97050cf99a3f31ca5660348597cf50acaec..8685a64eae618cc3b71561122f0a29e1442e1494 100644
--- a/components/suggestions/suggestions_store.cc
+++ b/components/suggestions/suggestions_store.cc
@@ -8,6 +8,7 @@
 
 #include "base/base64.h"
 #include "base/prefs/pref_service.h"
+#include "base/time/default_clock.h"
 #include "base/time/time.h"
 #include "components/pref_registry/pref_registry_syncable.h"
 #include "components/suggestions/suggestions_pref_names.h"
@@ -15,12 +16,19 @@
 namespace suggestions {
 
 SuggestionsStore::SuggestionsStore(PrefService* profile_prefs)
-    : pref_service_(profile_prefs) {
+    : pref_service_(profile_prefs), clock_(new base::DefaultClock()) {
   DCHECK(profile_prefs);
 }
 
+SuggestionsStore::SuggestionsStore() {
+}
+
 SuggestionsStore::~SuggestionsStore() {}
 
+void SuggestionsStore::SetClockForTesting(scoped_ptr<base::Clock> test_clock) {
+  this->clock_ = test_clock.Pass();
+}
+
 bool SuggestionsStore::LoadSuggestions(SuggestionsProfile* suggestions) {
   DCHECK(suggestions);
 
@@ -61,8 +69,8 @@ bool SuggestionsStore::LoadSuggestions(SuggestionsProfile* suggestions) {
 void SuggestionsStore::FilterExpiredSuggestions(
     SuggestionsProfile* suggestions) {
   SuggestionsProfile filtered_suggestions;
-  int64 now_usec = (base::Time::NowFromSystemTime() - base::Time::UnixEpoch())
-      .ToInternalValue();
+  int64 now_usec =
+      (this->clock_->Now() - base::Time::UnixEpoch()).ToInternalValue();
 
   for (int i = 0; i < suggestions->suggestions_size(); ++i) {
     ChromeSuggestion* suggestion = suggestions->mutable_suggestions(i);